CVE-2026-69378
Microsoft Exchange Server Denial of Service Vulnerability
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Exchange Server Denial of Service Vulnerability
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
- Record
CVE-2026-69378- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C - Weakness
- CWE-674
- Updated
- 2026-11-02
EUVDEUVD-2026-73128
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
- Record
EUVD-2026-73128- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-hp6f-8h4f-5pjq
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny...
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
- Record
GHSA-hp6f-8h4f-5pjq- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-674
- Updated
- 2026-11-02
NVD
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
- Record
CVE-2026-69378- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-674
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-69378 is a high vulnerability (CVSS 7.5) in Microsoft Exchange Server, published September 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.17%, the 67th percentile. No source names a fixed version.